Add some kind of functionality to parse and import other food databases

[jwesstrom]

Is your feature request related to a problem? Please describe.

While the tandoor open data is great, I would personally prefer to import my countries own database (Sweden). Not only will I then get it in my language, but it also includes nation specific items.
I believe it's quite common for nations to have food databases, so it would be a relevant feature for lots of people.

Describe the solution you'd like

Some kind of easy way to mass import data that is not native to tandoor.
It could just be a python script, set up and commented with clear examples.

I've attached Sweden and New Zealand's as excel files. Both downloaded from their web sites. I only know basic python, but even for me it would fairly trivial to write a parser that could extract the info I wanted and store in a text file.
However, I have no idea how I would import that in Tandoor.

Describe alternatives you've considered

No response

Additional context

concise-14-edition.xlsx
LivsmedelsDB_202502111508.xlsx